New themes in Moodle 2.0

New themes http://docs.moodle.org/en/Development:Themes_2.0 in Moodle 2.0:
* Many new themes in the core distribution
* All HTML and JS ouput is now far more efficient (server-side caching) and consistent (tableless layout, new CSS, YUI Framework)
* Themes can change the HTML of the page if they wish
* Core support for custom menus in all themes (for example at the top of the page)